i have done application using sencha touch2. in tab-bar i want to show to user, once iselect the item from tab-bar then need to change normal image to selected image. Right now i am doing via sass styles.Normal images are coming fine,but when i select/activate item. it is not changing normal icon to selected-icon. i gone some articles i have applied it is not working for me. below i have given code. can any one tell me how to achieve this one.

Hi, Thank you for your reply. Below i have given my complete code. when i activate/select item from tab-bar. image is not changing normal to selected image. can any one tell me how to acieve this one.
Here: is my main tab-bar view